Engine Oil spec
Engine Oil spec
(OP)
Is there more to specifying engine oil than just the viscosity?
I want to use a certain grade in my petrol (gasoline) car (15W-40). The container specs its for Diesel use, but my car book says this grade is fine.
Could there be other additives (or lack of) that make it unsuitable?
Cheers,
I want to use a certain grade in my petrol (gasoline) car (15W-40). The container specs its for Diesel use, but my car book says this grade is fine.
Could there be other additives (or lack of) that make it unsuitable?
Cheers,
Speedy
"Tell a man there are 300 billion stars in the universe and he'll believe you. Tell him a bench has wet paint on it and he'll have to touch to be sure."
RE: Engine Oil spec
Blacksmith
RE: Engine Oil spec
RE: Engine Oil spec
Using an S(x) rated oil in a CI engine could be a problem (perhaps not enough dispersants for CI use) but, using a C(x) rated oil in an SI engine should not raise undue concern in normal use.
That's about $.02 worth.
Rod
RE: Engine Oil spec
The Diesel specific 'detergents' are there to eliminate and/or reduce the amount of soot build-up as a by-product of Diesel Combustion and oxidation. A process which obviously does not occur (as predominately) in petrol engines. The detergents in Diesel oils also 'scavenge' the free carbon-12 particles in lower than optimal conditions, as opposed to Nitrous Oxide absorption, another purpose of the 'detergents' in Diesels. Due to the lower temps and pressures in petrol engines this leads to a steady reduction in the hardness of existing carbon compounds found in oil seals.
I am not saying that this will occur in EVERY engine, and to avoid Diesel oils like the plague...a nice, thick 40/70 Diesel Oil can do wonders for an 'ole smokey petrol engine, but I have also seen it destroy what little seals one also had left in it. It depends on varying factors regarding the seal types, age, oil type previously used, oil/filter change schedule, correct timings, and general condition of the motor.
I just cant see why one would put a 15W/40 Diesel Oil in a petrol motor. If they were one and the same, they wouldn't sell seperate Oils for Petrol cars.
That's just my opinion and it's probably worth less than evelrods ($0.01?)
RE: Engine Oil spec
Anyone got change for a penny?
Blacksmith
RE: Engine Oil spec
https://thegenesisnetwork.equilon.com/genesis/prodinfopdf/xref/pdspdfxref.asp?brandcode=50011
-=Whittey=-
RE: Engine Oil spec
http://www.rotella.com/products.php#tmultigrade
and on the "Technical Specifications" link. Also, on this link:
http://www.rotella.com/products/rotella_t.html
it says:
-quote-
For gasoline engines, it exceeds API SL, SJ and SH.
-endquote-
-=Whittey=-
RE: Engine Oil spec
RE: Engine Oil spec
RE: Engine Oil spec
BTW---This whole line of conversation is only worth that two cents if the car/engine in question is not already in "failure mode". If it is, no motor oil will fix it, or make it last longer, or give you better fuel mileage, or...
However, if it burns a lot of oil it will most certainly kill ANY catt.
Rod