Hi Guys,
I had an oil change done one this car at well known chain garage and they put in 5w30, I did the rest of the service according the haynes manual but the manual advised 10w40 or 15w30 should i rechange the oil?
kush
{Subject header changed to reflect question being asked - DD}
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>>should i rechange the oil?
No
Number_Cruncher
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you dont say what country you are in because if your toes at this time are frost bitten then 5w30 is indeed recommended
however if you are in clacton maybe 10w30 may be more appropriate
i would work out where you live and if indeed clactonish go back to fast fit and confirm its not a blunt instrument pen issue
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>>if you are in clacton maybe 10w30 may be more appropriate
I disagree - the cold viscosity of 5W30 is fine - it's only a transient operating condition anyway.
Number_Cruncher
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i am in basingstoke, i also have a 3litre jag xtype which goes the dealers an they always use 0w30.
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kush
5W-30 will be fine. You'll get about 3% better fuel consumption, but may burn a little more oil.
Just remember to keep an eye on the level regularly.
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bell boy dismissed cos he wont put oil in an old volvo that will eat this viscosity at an alarming rate
fair does
next
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bell boy dismissed
Perish the thought! Just disagreed with, that's all.
Number_Cruncher
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cars only done 53000 miles not used too much oil in the past, having said I have no clue what kinda oil was in there in the first place
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sorry guys dont want to cause trouble its just i would be a little afraid to use that oil thats all,it feels thinner than water between your fingers and im a die hard 20/50 man :-)
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bb
I know what you mean; it was easy when Duckhams Q did for everything - but oil isn't what it once was and I can't think of a single modern car that you could safely put 20W-50 into.
The thin stuff seems to get the job done and, although I'd have gone for a 10W-40 as a preferrence here, 5W-30 certainly won't do any harm.
[And hey; winter's coming... Anything that gets them cranking over a bit faster has to be a bonus.]
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I can't find the viscosity for 15W-30, but here are some other W-30 viscosities.
If 15W-30 is OK, as per the manual, then, so is 5W-30, because the only difference is the cold viscosity - which you **really** want to be as small as possible, because it's still **much** more viscous than the 100C viscosity
0W-30 is 57.3 cST @40C & 11.3 cST @100C
5W-30 is 59.5 cST @40C & 11.7 cST @100C
10W-30 is 66.1 cST @40C & 11.7 cST @100C
Number_Cruncher
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If 15W-30 is OK as per the manual then so is 5W-30 because the only difference is the cold viscosity - which you **really** want to be as small as possible
I've always believed that - what I don't understand is why anything other than 0W is offered (in the UK)?
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so what is 0w40 then? the oli cap on my jag recomends 5w30 but the dealer reckons its better to put in 0w40
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>>but the dealer reckons its better to put in 0w40
Does they have more mark up on the 0W-40?
How do the dealer **know** it's better? What testing have they done to determine this? i.e., do they really know, or is it marketing BS?
If the cap on the engine says 5W-30, then that seems reasonable to me. The only time you might need to deviate is on an older engine which is still in good nick, because there are better oils available now. It's not too long ago that 5W-30 was not at all a mainstream oil spec.
In the Jag, the only time I would bother with the 40 weight oil is if I was running the engine in competition, or in a very hot climate. For normal use, the 5W-30, or even better 0W-30 will be fine.
Number_Cruncher
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There has been a suggestion that the shorter the span from XW to XX (i.e, 0W/30) the better, as it implies less reliance on viscosity improvers. However, the main benefit from some grade such as 0W/30 is that the base oil is likely to be synthetic, which is relevant to oxidation and high teperatures, for example at the piston rings, or turbo bearings. Mineral based oils tend to be 15W/XX etc, and more liable to degradation. That in itself is not really enough: surely its the call of the engine mfr to decree the quality required as well as the viscosity. So, some indications, such as Ford or GM, VW or Merc quality designations over and above the ACEA sequences. That should be enough, unless you have recourse to advice from a tribologist, which is a rare on a forum and even rarer at a dealer!!!!
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