My oil pressure always ran slightly higher on my '93 3.9L on
synthetic blend. I always noticed a decrease in oil pressure over
the life of an oil change, with conventional oil. Virtually no
decrease with blended.
That is one of the reasons I am going to stick with blended or very
possibly switch to full synthetic. The oil pressure guage suggests
that it is a more durable oil.
My understanding is that synthetic oil is not effected by contaminants
like gasoline and heat which tends to break down conventional oils.
>From my experience the 10W30 oil you drained out was probably less
viscous than the 5W30 you put in.
Scott May
'98 CC Sport+ 4x4 5.2L with a redesigned drink crusher
-------------------------------
Scott May
Manager of Computer Services
State University of New York
College of Technology at Delhi
-------------------------------
Michael D Gemelke wrote:
>
> I just replaced my 10W30 winter weight oil with some 5W30 synthetic blend
> and Slick50 additive. I have noticed that since the change, my oil
> pressure gauge reads noticeably higher. The oil level is fine (right in
> the middle of the acceptable range). Anyone know why the oil pressure
> would increase with the change to 5W30, synthetic, or PTFE additive?
>
> -Mike
> '95 Dakota 3.9L V6 manual XCAB
>
> Michael D Gemelke
> Electronics Design Engineer
> Enterprise Storage Group
> Western Digital Corporation
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