Oil pressure.

[Bricksack]

Is it bad when my oil pressure is almost at 80 when cold start . 60 when driving . When stopped goes to 40. On 99 454

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[LoudnLifted88]

Is it bad when my oil pressure is almost at 80 when cold start . 60 when driving . When stopped goes to 40. On 99 454

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mins 60 cold 45 ish driving and 20 warm idle 98 305 so id say its normal

 

[Bearcat91]

95 with a 305 bout 70 cold 60 driving 30 at warm idle for me so sounds good!

 

[ChrisAU]

Perfectly normal.

 

[Horns]

That's normal. I drove my dad's 98 yesterday and that's almost exactly what his was doing.

 

[94Sierra4x4]

Fvcking Canadian dash, my oil pressure is like 300 kPa cold, 275 driving, 140 warm idle -.- kPa, the hell is that shiet..

Like 45 psi cold, 40 psi driving, 20 psi warm idle.

 

[Tempted]

Just don't make the mistake I did and let someone convince you that high oil pressure is better than low oil pressure.

 

[bluex]

Just follow the age old rule of 10 psi per 1000 rpm an you'll be fine.

 

[Bricksack]

When i got the truck it wasnt that high. Would go up to maybe 60 at start never higher. I put some marvel mystery oil in it a few days ago due to it felt like the engine was binding
. Could it be due to that. Changeing the oil tomorrow. Just made my heart race when gauge was all the way over. I thought something was about to blow

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[ChrisAU]

When i got the truck it wasnt that high. Would go up to maybe 60 at start never higher. I put some marvel mystery oil in it a few days ago due to it felt like the engine was binding
. Could it be due to that. Changeing the oil tomorrow. Just made my heart race when gauge was all the way over. I thought something was about to blow

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Yes if you overfilled by adding the MMO without draining a quart. I'd change the oil ASAP. MMO is meant to be a replacement for a quart, not an additive.