Thanks for the suggestions. I asked for an explanation because many people I
have asked keep suggesting different viscosities. I do not know why! What
I have researched is that certain oils provide protection between certain
temperature ranges. But why so many, and which to choose is difficult for
me to figure out.
If you don't have the driver's handbook, worth getting one or downloading
it. That will give the oil required. On an old car like this it will be
easy to find a modern oil that meets - or exceeds - the spec.
*A closed mouth gathers no feet.*
Dave Plowman email@example.com London SW
Exactly. That's why saying that 0w-40 is too thin and will start to leak
doesn't make sense to me. Oil is at its thinnest when at operating temp
(say 100 C), and at that temp, a 0w-40 will be just as thin as a 10w-40 or
15w-40 or a straight 40. And as the temp drops, it only gets thicker from
there, not thinner. A 0w-40 will not thicken as much as a 10w-40 when the
As to the OP, I'd suggest you use the oil that meets the specs described in
the owner's manual.
Uh, if the 0w40 is M1, and it has over 5-7 thousand miles on it, it may
be a toss up - but yep, the 10w30 is supposed to be "thinner"
| 330Xi wrote:
| > the new fad is 0w 40.... but in an old car, it can start to leak
| > is so thin, not always the best unless all your gaskets are new.
| > stick with what the manual suggests and you'll be fine
| Pop quiz:
| Which oil is thinner when the engine is running at normal operating
| temperature? 0W40 or 10W30?
| -Fred W
No it is just as thick as 10-40, 15-40, or any other 40 .
It is just lower viscosity at LOW temps - which only last until it warms
If cold 10W-xx isn't leaking, 0W-xx won't be leaking either.
| the new fad is 0w 40.... but in an old car, it can start to leak
| is so thin, not always the best unless all your gaskets are new.
| stick with what the manual suggests and you'll be fine
Assuming the engine is not leaking oil and not burning it at an excessive
rate, A good synthetic (Mobil 1, etc) in the recommended (in your owner's
You can also go overkill and use Amsoil, Royal Purple, Redline, etc. Great
lubricants but very pricey and probably not worth the investment except in a
new car where you intend to go with extended change intervals.
R / John
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