Oils ain't oils? - Alfa Romeo Forum
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(Post Link) post #1 of 6 Old 25-08-06 Thread Starter
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Oils ain't oils?

Now here's a goodin'
What kind of oil??
At the moment my mechanics are using a Mobil brand 15w/40 Mineral oil.
Just wondering how important it is to use synthetics or semi's , especially if i'm gonna change it every 5000 kms. Keep in mind i live in the tropics.
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Re: Oils ain't oils?

Frogman, there's quite a few threads about oils etc. If you use the search facility you'll find them
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(Post Link) post #3 of 6 Old 26-08-06 Thread Starter
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Re: Oils ain't oils?

Well i searched this forum and no specific ones came up is all
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Re: Oils ain't oils?

im using esso 10w/40 it seems fine for malta. is anyone using selenia racing on there ts? my brother tried it on his civic and it flew. im too much of a whus to try it on my standard engine. any intel?
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Re: Oils ain't oils?

Frogman: What't the oiltemp of your engine like typically? If it's below 100°c a xw-40 oil will be fine, but if it's going up to 110-120°C I'd go for a xw-50 or 60.

To answer your other question: A good synthetic oil will be superior to a very good mineral oil, but as with anything you get what you pay for but no more...

With a synthetic oil there wouldn't be a need to change the oil every 5000km, unless you get an extremely wide viscosity range like for example a 5w-50. Due to shearing the viscosity would likely ddrop to 40 again after a few thousand km, and due to evaporation and burning the cold viscosity would likely go up to 10w or 15w.

The less cheap synthetics will have better quality dopes and in that case the oil would stay good for at least 20000 km.

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