Oil For Cold Conditions

[czy18e]

i just moved to the hills where in the morning when i start my car it is usually below 5 degrees and my motor has developed a loud tapping i was wondering what oil you guys recommend.

When on the coast i ran pennzoil gt performance 25w50.

thanks.

[czy18e]

Anybody?

[Oosh]

25w50 seems pretty think even for normal conditions, unless your engine has a fair bit of wear and needs it, speaking of which what type of engine are we talking about here?

[Topaz]

I used $60 Shell Ultra 5w40 in my GTR

but most people like Mobil 1 5w50 which is about $10 more

25w50 is thick....

[djr81]

I used $60 Shell Ultra 5w40 in my GTR

but most people like Mobil 1 5w50 which is about $10 more

25w50 is thick....

<{POST_SNAPBACK}>

Broadly, the first number in the viscosity sequence (X W Y) is the low temperature viscosity. So a 5W40 is less viscous (thinner, if you will) at low temperatures than a 25W50 oil. The other number is the high temperature viscosity, hence a 5W50 oil will be more viscous than a 5W40 oil at higher temperatures. I can't remember what the two temperatures are, but they form part of a standard of sorts.

[ed]

I think the 2nd viscosity rating is at 100 degrees celcius?

[czy18e]

It s an rb 25det on the limit a bit.

I'm going to try the motul 8100 full synthetic 5w 40.

Thanks for the input.

I suppose there is no reason to change from this oil when summer comes around?

[Sydneykid]

We use Castrol Formula R Synthetic 0W-40 in the Blue Mountains

If you park you car in a garage, put a rug (or a piece of old carpet) under the engine. That will stop the concrete sucking out all of the temperature overnight.

cheers

Edited August 30, 2005 by Sydneykid

[Scooby]

unless you live at Thredbo in the winter and the Pilbara desert in summer do we really get climates in Australia that justify the use of a special oil for everday use?

if we lived in -25deg C Canada I could understand.

[czy18e]

Thanks sydney kid will do.(clever)

In winter the temp is often 0 and in summer often 35 plus.

[Busky2k]

25W50 is damn thick for those conditions. You shouldnt be using something that thick anyways, even if it isnt that cold. SK's recommendation is good. Mobil 1 OW40 is good too.