Thread: diesel oil into petrol car?

15/40 may be slightly higher viscosity than recommended for the Subaru, but apart from that there should be no problem - the oil will exceed requirements for the petrol engine.

Quite a number of farms for example use the same engine oil in diesel and petrol engines, and this is invariably a normal diesel oil. (I don't but that is only because the diesel oil is more expensive, and I don't use enough to buy in large enough quantities to make it worthwhile)

John

diesel oils have more detergent in them - good for cleaning out an old petrol motor.

LRH

above 0* C a 15w-40 and 10w-40 are virtually indistinguishable in terms of viscosity.
Some lower grade diesel oils (earlier than CI-4, especially if not SL dual rated) may poison the cat (as in catalytic converter, not the moggy )
Otherwise, most diesel oils are a better oil than an equivalent petrol engine oil in that the additive package is more robust, and as LRH said, better detergents/dispersants.

I was always told this was good for cleaning out the engine - re detergent etc, but not so god for l;ong term use also in old engines may remove the carbon etc that seals the rings and make the engine blow smoke..... just what i have been told.... ask castrol helpline.

hmm,
in that case--
I have some RX super I might chuck in the Brumby

I agree with other,if the motor is HEALTHY its actually better for the motor due to the extra detergents.
If its worn out it will remove the carbons built up in the motor and actually make the motor use/burn more oil.
Andrew

Originally Posted by Pedro_The_Swift

hmm,
in that case--
I have some RX super I might chuck in the Brumby

The guy I bought my V8 D1 off swore by this stuff. Said he used it in the Disco and his WRX. Reckoned that it was good due to the detergents etc as posted previously.

During my Navy days, an oil we called, OMD113, went into all Internal Combustion Engines. From the big main diesels of subs and patrol boats, to the generators and boat engines of the ships, even into the Admirals Humber Super Snipe and the ships Mini Moke, it was even mixed into super petrol for the rescue boats outboards.

OMD113, Oil Mineral Detergent, the 113 is a Milspec viscosity index, approximately equal to 20\40.

I'd say use it.