I'm not sure where you live, but it may be due to the onset of warm weather.
You should be running 20W-50 oil, such as Castrol GTX, unless the temperature
is still at the freezing level in your neighborhood. I use10W-40 GTX during
what passes for the cold season in the Seattle area of the USA. Once night time
temperatures barely drop below 50F and daytime temps rise above 60F, I notice
a definite drop in oil pressure on my 18V (1979) engine. Time for the Spring
oil change to 20W-50 GTX.
Regards,
Jerry Causey
1967 MGB GT
> Noticed that my idle (700-800 RPM) oil pressure has dropped to 15 psi from
> its normal 20 psi after running and hot. It still is a steady 50-52 psi when
> cruising in OD. Does this rather sudden ( just noticed it today ) 5 psi
> drop during idle indicate something that needs looking at ? I thought I read
> on this list that oil pressure at idle needs to be a minmum of 20 psi. The
> car still seems to run great and I lose / leak maybe a quart per 750-1000
> miles. I run Ursa 15W-40W oil.
>
> Comments or advice, please?
>
> Bruce Durgin
> 64 B
>
>
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