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MG MGB Technical - Engine oil type - Supercharged / stressed engine
In getting prepared to have a dyno run to set up my MGB supercharged engine (car is a 1930's special)several of the dyno technicians queried the type of engine oil I was using. Strangely most of them strongly suggested that I use Penrite HPR40 (SAE 25W-70)which they felt would afford better performance and protection for a stressed supercharged engine. So now I am in a quandary as the engine is run in and I have just changed the running in oil to Duckhams 20W/50. Does anyone have any similar experiences or advice?
PS for you EDIS users I will post my MAP once the car is dyno tuned.
|On my supercharged 1500 I am running Pennzoil 20-50 with 20% Lucas oil addititive. This was recommended by our local mg specialists for engine longevity, not necessarily for the blown engine. I do find that the Lucal makes the engine turn over considerably slower when cold, but now that spring is here it should be easier.|
Only time will tell how well this works out!
Or maybe not as I have a replacement 1800 in the works.
|The problem with mineral oils are that they are not shear stable, so your 25W70 will be 25W50 in a 1000miles, the Duckhams will be a 20W40.|
Cold flow is not so good but then Penrite is an Oz oil.
This thread was discussed on 01/04/2007
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