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BmW1819 11-16-2011 09:07 PM

s52 low oil pressure
well i just had my s52 rebuilt with new pistons/ bearings complete new head, and i get low oil pressure about 5-7 psi at Hot idle after the oil temp rises to operating temp. I am really stumped and not sure what to do other than pulling it out again and checking all the clearances, but all the bearings are new so not sure :( iam using 10w40 oil started with 5w30

Steve30 11-16-2011 11:16 PM

well these motors are known to have low oil pressure at idle but did you check the pickup for cracks in the neck?

Seyar 11-17-2011 01:42 AM

My old motor did the same once the car hit normal temp.

ScotcH 11-17-2011 02:05 AM

Where does it start when cold? Does the pressure hit 60 psi at higher revs (6000rpm)? If so, I would not worry about it. If not, you have issues ...

sproule905 11-17-2011 09:45 AM

interesting. I use 5W30 in my 328is.. never burns or leaks and always has good pressure.. Can't say the same for start-up

BmW1819 11-21-2011 09:39 PM

ok well i changed everything lol other than 2 thing oil squirters/ jets and the check valve in the head. i got great pressure at 3000 rpm. At cold idle my pressure is around 25 psi than slowly drops to min i just see that light on it never did this before but researching lots of peeps have this problem :( what do u think??

BmW1819 12-05-2011 08:08 PM

does anybody no what normal oil temp is in city driving is???

cormier 12-05-2011 08:35 PM

What are you running at now?

BmW1819 12-05-2011 09:21 PM

in this weather it's 180 when my oil light comes on :( and my pressure is close to 8 psi and at 160-170 it's at 10 psi

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