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solarispete solarispete is offline
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Join Date: Oct 2010
Location: Vancouver, BC
Posts: 69
Oil pressure for synthetic oils

Hi all,

i have an 1985 Euro 930. I have been using Pensoil 20w50 (yellow bottle) since the previous
owner and mechanic swears by it. Recently had an oil change and my current mechanic suggested to try the Redline Synthetic 10w60. He has heard great things about it so we tried it out.

One thing I noticed is that the oil pressure seems to read a bit lower than before, especially when the engine is warmed up.
With the new oil, Druck Press reading
1000 rpm = 2
2000 rpm = 3
3000+ rpm = 4-4.5
1000 rpm = 1
2000 rprm = 2
3000 rpm = 3
4000+ rpm = 3.5
5000+ rpm = 4

I am pretty sure with the Pensoil it was reading 5 when 5000+ rpm.

I have done some reading and people say that synthetic is so much more "fluid" and higher
viscosity that you normally get lower oil pressure readings.

So my question is, what is more important, oil pressure or lubrication viscosity?

Some people even went back to regular oils.

My engine has 130,000 miles, but the previous owner actually had an engine rebuilt at 120,000 miles so the engine is relatively fresh in top end (new pistons, valves, etc).

What do you recommend? Should I go back to Pensoil 20w50?

Old 02-04-2014, 01:09 PM
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