Oil Pressure?

[Forzfed]

For this time of season probably but it should be fine for summer.

[Steve Wood]

The pressure is more reasonable.  My only negative comment is that I have seldom seen anything good reported about Royal Purple outside of their own advertising.

[Forzfed]

My buddy ran it in his Stage II.  I have another buddy that runs mobil 10w30 in his little 2 liter 4 cyl that runs 146 mph in the 1/4.

[Steve Wood]

That makes for good ads but not necessarily low wear and long life

My own experience with it consisted of one case.  I noticed that after a couple of thousand miles, on a hot day, the oil pressure was dropping.  Went back to Valvoline Racing Oil and the pressure was steady no matter how hot the day and no matter how many miles.

Mobil1 consistently has done well thru out the years.

[Forzfed]

Interesting!  I guess I will have to see how it does.  It was cheap enough, worked out to $6.50/quart your price.

[Steve Wood]

It's a lot hotter here.

But, when I read the wear rating on 540rat's list, I decided that it was simply not a very good oil.

[Top Speed]

Steve, I came to the same conclusion as well. 

[Steve Wood]

Many are proud of how much oil pressure their engine is making.  I wonder how much of this oil pressure is causing the bypass valve in the filter to blow open and circulate unfiltered oil thru the engine even after the oil has warmed up?

The low end number on the oil rating will have quite a bit to do with that as well.  If the oil is a 15-50, it will be far more likely to cause the bypass valve to pop open than a 0-50 would.

The quality of the oil filter, and its size, will affect this as well.  Of course, a filter with very tiny passages in the filter media will be more prone to trigger the bypass valve as well.  It really does not matter how well your filter filters if the oil is all going thru the bypass when the oil is cold.  Quality of oil filters vary and some actually tell you what the bypass valve is rated at pressure-wise.  The Fram filters are generally pretty sorry in construction, but the Fram Racing filters were made pretty well.  I have always found the Baldwin filters to be good as well.  Both have higher than normal rated bypass valves.  Wix filters usually get a high rating and they make the Napa filters as well.  Do your research.

Excessive oil pressure does more than pop open the bypass valve.  It causes wear on the front cam bearing which leads to drop in oil flow and it adds strain to the oil pump drive and cam sensor gear.  High oil pressure is not always the same as having high volume thru the engine.  Pressure is created by resistance to flow.  Just like on a turbo.

Oil pressure at idle is not a critical number.  There is very little load on the mechanical bits of an engine at idle.  Lawrence Conley told me once that a Buick with 7 psi at idle was fine as long as it had good pressure under power.  60 psi at wide open throttle on top end is fine.  75 psi is overkill on a 6000 rpm engine and not only leads to increased wear, it also creates excess power consumption that is not going to the rear tires.

Oils have improved a lot over the the past 30 years.  Do your research and don't believe ads.  Believe research and testing.

[larrym]

I usually use any good brand name oil that is on sale, I typically run a weight that gives me a heat soaked pressure that is around 20 psi. Think my last change was Castrol GTX  10/30. It never stays in there long plus a WIX filter

[Scoobum]

Oil-15w40 diesel
Filter-Wix
Approximately 500 passes on the bearing from my engine on the right
Oil pump mods courtesy of JB Racing out of Montreal Quebec Canada

Bearing...https://www.youtube.com/watch?v=cp7owFIjaa4
Oil Filter-...https://www.youtube.com/watch?v=1OUPGI-rD38

[Tim Hensley]

That filter dose clear the SLIC

[Steve Wood]

I put Mobil1 5-30 extended life in my riding mower the other day

[earlbrown]

I put Mobil1 5-30 extended life in my riding mower the other day

I do that too.  Not one single thing I own has dino oil in it.   The extra fuel mileage more that pays for the extra initial cost.

And the mower bogs less with full synthetic.

[TexasT]

If your mower is bogging you might need more power. Or cut more often.

[Steve Wood]

I put Mobil1 5-30 extended life in my riding mower the other day

I do that too.  Not one single thing I own has dino oil in it.   The extra fuel mileage more that pays for the extra initial cost.

And the mower bogs less with full synthetic.

I noticed mine acted like it had a bit more power and it starts easier