mobile 1 high mileage oil

[hey]

I have 80000 mileage on my 2001 x5 4.4.im using bmw 5w30 oil.It appears that my upper timing chain gasket is leaking.Considering my mileage should i switch to mobile 1 high mile oil.The leak is very minor and wandering if the heavier oil would stop it as well be just better for age of the engine.Thanks

[bigbabyE53]

My 01 4.4 has 127k on it and has had nothing but bmw 5w30 full synthetic in it since brand new. I don't think changing the viscosity of the oil will help with the leak.

[JCL]

Originally Posted by hey

I have 80000 miles on my 2001 x5 4.4. I'm using BMW 5w30 oil. It appears that my upper timing chain gasket is leaking. Considering my mileage should I switch to Mobil 1 High Mileage oil.

No.

[thunderX]

I been using this on my other car (turbo) for over 5 or more years, works great

It doesn't primarily stop leaks from being 10W-30 vs. 5W-30- it does it by including a seal conditioner in the oil formula.

I am curious also to know if this oil is safe to use on our Xs.

[JCL]

I am nervous about oils that have specific additives designed to swell up seals. I don't think it is a sound engineering approach. All seals won't react the same, or to the same degree, and some seals may be damaged by those additives. If they only put a small enough amount in to be safe then I wouldn't expect much if any benefit. That makes it more of a marketing campaign than a valuable product.

10w30 has no benefit over 5w30 for this objective; they are both a 30 weight when warm, which is when oil would be consumed. The 10w is just thicker when cold, and so can increase cold start wear.

[thunderX]

Thanks for replying, JCL.