Oil capacity question

[xb-60]

Originally Posted by tortuga

Now that i have the correct amount of oil in there the pressure is reading low; It is now sort of a constant 37 psi whereas before it was sort of constantly 65+ psi...I did go from 20w50 to 0w40 which is a dramatic change, but the weird thing is the mechanical gauge (went back to it as the electric was a POS)...The car is running GREAT with the lighter and correct amount of oil, but the low reading at higher revs bothers me...is 37psi just indicative of great flow? Also noticed that the valves have really quieted down. I've read that quite a few guys run 0W40...but is it too light for THIS motor?

tortuga, I would say that 37psi is fine with a 0W-40 oil.
Reasoning - years ago, one of the Australian motoring magazines drove a twin cam Alfa from Sydney to Perth (4000km / 2500 miles) in 29 hours, averaging 85mph including all stops. For almost the whole distance, the engine was running at 10psi, with no damage. Problem most likely was one of the slugs that blank off the crank oilway cross drillings came out (same thing has happened to mine, twice), so pressure at crank bearings was minimal.
If you have 37psi with 0W-40, you're laughing.

Cheers,
Glen

[tortuga]

Found the problem while surfing the net in an MG forum in all places: If (like me) you replace your bulbs with nice bright LEDs, they are a little longer: In the press gauge they interfere with the workings of the bourdon tube, effectively putting a high stop on oil pressure!

Need to make a little spacer for oil pressure light...