" BP's Visco 7 10W-30?"
That`s the one Screwloose, thanks. I always wondered how the ring packs and bearing clearances in the cars of the day, handled that.
Also whether there is a current comparison.
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Oddly enough; current 10W-30s in old classic cars seem to work OK. Maybe it's a different intensity of usage, or better anti-burn additives; but my personal view is that it's less carbon build-up allowing the rings etc. to work better - the biggest single improvement in oils of all time was API/SG in the late 80s.
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Screwloose, Are you seeing any engine wear on cars that have been serviced according to the book?
I`m changing Mobil 1 0w40 out at 6,000 miles, rather than Fiats 12,000 miles. It seems they have now gone to 18,000 miles on 5w30 oil. It seems same as Vauxhall with their version of the 1.3 Multijet..
Always grew up with halving the interval, but do wonder sometimes,.
Edited by oilrag on 04/07/2008 at 17:08
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I remember the ad, it showed a Mk3 Cortina with a chap filling the engine with this oil, and (I think) the same chap filling the tank with petrol, the ad line went something like "Filling up with this (the oil) here can save money filling up here".
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On cars that have sensible oil changes with quality oil there is now NO visible engine wear - regardless of mileage.
Back in the days we are discussing; once a car was past 50,000 there was a "fingernail" ridge in the top of the bore and a 100,000 mile car was something special. [And well knackered.] Cords "ridge-dodger" Dykes rings were readily available to cope with oval, barrel-shaped bores and the inevitable smoke trail...
I'm still of the opinion that it's 6,000 for a premium mineral and 8-10,000 max for a good semi-synth. Fully synth is required for turbo petrols because of the turbo shaft temp, with a 12,000 max period.
For low-mileage cars an annual change is needed - except for Sunday classics.
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Interesting Screwloose Thanks.
you mention the biggest improvement of all time being API SG. was that the sludge issue? if so was that happening within recommended oil change intervals at the time?
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oilrag
Yes; for me, that was the big step. Before SG, everything inside an engine was coated with a sticky, black, sludge. [Particularly if GTX was used.] With SG oil, it was spotless - regardless of mileage.
Using HD30 in petrol cars used to keep them a bit cleaner; but SG certainly made the biggest, visable, difference.
It meant the end of "Black Death" carbon-choking too; that was a regular engine-killer in the 70s and early 80's.
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Just two of many testimonials there:
www.amsoil.com/testimonials/409000.aspx
" 409,000-Mile Oil Drain Interval Mack Engine Teardown .... "
www.amsoil.com/testimonials/chalkley.aspx
"The Passat now has over 278,000 miles on it and its still running the same gear lube. Chalkley changes his motor oil in the Passat at 50,000 mile drain intervals. Theres no by-pass kit on it either, he said, and Ive never had a problem. Not a one. "
Edited by jbif on 04/07/2008 at 18:10
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Oilrag said:
I had a Maestro Clubman D
So did I. I even changed the gearbox oil at about 40K
The floor rotted out!
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I hated that Maestro Box Tom.
Gearbox change interval was 24,000 on `engine oil`and I was doing around 28,000 a year at the time. I seem to remember a wheel had to come off and some under arch trim to get at it.
`engine oil`in the gearbox.... I think I did that 6 times, while the polo C of the old Man`s was on proper gear oil with no change and gearbox as good as new at 17yrs and 110,000 on the original oil.
Edited by oilrag on 04/07/2008 at 20:05
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Thanks, Screwloose, I think it`s the memory of the sludge era that makes it so difficult to use the regular interval now ;)
Searching the the web, it just seems to be America now?
tinyurl.com/6fw3jn
I only saw this once, in an early 1960`s Bedford van. I don`t know how that survived as it only ever received top ups (yes family) for years, before I took things in hand with the spanners aged 14.
Edited by oilrag on 04/07/2008 at 20:24
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oilrag
I've seen that mess before inside ex-US engines; paraffin wax residue. Some oil sold in the US is simply shocking - wouldn't last five minutes in a high-stressed Euro car.
Even with 5,000 mile oil changes, the US rubbish-oil issue caught VAG out on the 20-valve 1.8T - tens of thousands of blown engines from sludge-blocked pick-ups nearly bankrupted them and yet, over here, no real problem.
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Thanks Screwloose I think it`s the memory of the sludge era that makes it so difficult to use the regular interval now ;)
Before we all wave bye bye to black sludge, my indy showed me the results he found in 2 V12's of late 90's vintage, it looked very like what you'd find in a mk3 escort.
Maybe the customers who paid nearly 100K apiece for those cars when new would have liked a poke nose.
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>>I hated that Maestro Box Tom.
I found it pretty relaxing. I learned to drive at 10MPH below the national speed limit because it didn't have enough go to overtake what was in front until they fell 20MPH below the national speed limit. See stunorthants26 The right to drive more slowly? thread. It also did 60 MPG!
IIRC the gearbox was VW sourced, to take the torque.
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once a car was past 50 000 there was a "fingernail" ridge in the top of the bore and a 100 000 mile car was something special. [And well knackered.]
And when you let a second-hand car rev closer to its red line than it was used to you could break the top ring against that ridge*, ouch! or (more usually) curtains...
Are you saying Screwloose that modern cars whose oil is changed fairly regularly don't get the ridge? Am I taking care of my car's engine for nothing? :o}
*Owing to stretch in the conrod around tdc at very high rpm or breakdown of the oil film in the big and small-end bearings, itself not a very good thing to happen...
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Lud
Yes; for most normal-use cars, the ridge has gone - on many, you can still see the honing marks on the bores up to 100K+.
Feel free to explore the upper reaches of the rev-counter....
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I think mine's done more like 150K though...
No, it's a bit long in the tooth for too much of that stuff... I'll wait till there's another in the offing anyway.
:o}
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You're not gonna believe this but ... I did the tappets on a Simca 1301 once, and when I removed the rocker cover there was no oil there just mega-thick black sludge.
The valve clearances were so huge I could get the whole feeler gauge in there.
Car ran sweet once I'd tuned it.
I remember 2 particular customers I had who never, ever, not never changed their oil,
One had the Ford V6 in a long wheelbase tranny and the other had a Volvo 240, the Tranny went well over the 100 thou ok.
I had a Toyota Hiace back in the the 80's and I stuck in some Mobile 1 ... I couldn't believe the clatter from the timing chain next morning so I replaced it with GTX and flogged the Mobile to my m8 : )
I've always changed my oil every 6 thou - whatever it says on the can, especially as I have an Almera 1.8 and ... I might even look at the Mobile 1 again.
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Back in the late 60's one of my duties as an apprentice was checking oil levels on the TK Bedford range. In cold weather topping up was done by heaped spoonfuls.
Changing Diff oil meant warming the toffee like new oil until it would flow. It's all so easy these days - just read the instructions on the tin.
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meant warming the toffee like new oil until it would flow.
Ahh; EP-90/140, what fun that was to coax out of it's tin in a freezing workshop.
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Easy, we just kept the 140 barrel fairly close to the salamander.
Cue be-hankied Yorkshiremen saying "Salamander?... Luxury!"
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EP140 is still used in the oil filled front wheel bearings of the Iveco 7.5t range.
Painfully slow to refill after any work that entails draining.
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