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The camshaft driven oil pump design dates from circa 1967 when used in the Rover V8 engine for the first time, and I dare say earlier than that when still with Buick. In 1976 the depth of the gears increased, and that design remained unchaned up until the early 1990s when the crankshaft driven oil pump was introduced.
The recommended oil by Rover and Land Rover for their engines during the 1970s was typically 20W50.
Of course you can use a 15W40 oil, but a 20W50 or 60 oil would be better.
Ron.
I've seen all weights of oils used in these engines, personally I use a 15w40 diesel oil in all customers V8's, and I would suspect that the poor oil pressure on start up is not viscosity related, more likely filter issues, worn pump OR a problem with the timing cover gasket leaking internally where it meets the block face gallery holes, allowing the gallery to empty overnight.
Blue smoke if excessive is a worry from a Rover V8, only ones I have seen doing this have had blown head gasket/s at the upper section of the fire rings and actually suck in engine oil returning from the heads on the intake stroke, producing smoke at idle and on overrun. Also produces a fair bit more crankcase pressure, and gives symptoms similar to a broken piston/ rings without any noises.
Your oil consumption sounds acceptable, most will use up to a litre every 5000km
JC
Hi.
Would a a diesel oil not remove sludge and block up other parts of the engine due to the high detergent levels? Or start leaks?
Cheers.
My understanding is that is a very real possibilty. Oil consumption will also increase until such time as the inside of the engine is somewhat cleaner.
Personally I would stay away from diesel engine oil in a petrol engine. That is just my opinion given that oil manufacturers produce products for specific engine types, else they would make "one suits all" and they don't.
Ron.
Hmm, sorry, but that's a nonsense straight away...Quote:
Originally Posted by RoverP6B
If you check out actual kinematic viscosities above 0*C, some 15W-x oils are lighter/thinner than some 5W-x oils at the same temp.
Go and have a study up on how SAE oil viscosity ranges work, there's a ton of reference material IIRC in "The Good Oil" forum.
A very brief reply.Quote:
Originally Posted by RoverP6B
Most diesel oils are 'mixed fleet' oils, meaning they meet certain diesel and petrol engine specs.
Modern petrol specs, particularly the API SM spec and particularly GF-4 'fuel efficiency' brews have vastly reduced levels of certain additives used as basic EP (extreme pressure) and AW (anti-wear) additives in older blends, eg Phosphorous as ZDDP.
Mixed fleet/dual rated oils of CH-4 or better often use better, more expensive additives to replace these older EP/AW additives for heavy duty use, so generally speaking a diesel oil in the correct grade will protect an older design engine such as the older 3.5's thanks to the metallurgy involved, etc better than a modern SM rated petrol oil.
Sorry to ressurect an old thread. What do yo mean by better than CH-4? Newer? I can get CI-4 and an older one, forget which std butnolder than CH-4. Would this be ok? Brand is Total Rubia TIR 7400.
Yep, CI-4 or CI-4+ or ACEA E4/6
A diesel oil sporting those specs would be my pick in a V8. ;)
Thanks! And there I was, about to use HPR30, which is fine, but diesel oil is easier to get.
Quote:
Originally Posted by rick130
Quote:
Originally Posted by Davo
I forgot to add a caveat.
Use an oil with those specs but only if it's dual rated with a corresponding petrol engine API SJ, SM or SL spec and/or an ACEA A3,4 or 5 spec too
My preferred (ATM) HD 10W-40 full syn diesel oil says not to use in Petrol engines.