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Synthetic motor oil

Tiny
DOODLE50
  • MEMBER
  • 1989 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • MANUAL
  • 200 MILES
I have a RamJet 350 Crate Engine PFI with Iron Vortec Heads in a 1989 3/4 ton Suburban. I bought it second hand with low miles and stuck it in. My question is regarding oil pressure and synthetic oil. This motor has always had Mobil-1 synthetic. The pressure is high at initial start up but after the motor warms up the pressure seems low to me but I have no experience with synthetic oil. Should I be running a high volume oil-pump?
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Friday, December 17th, 2010 AT 12:56 AM

3 Replies

Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
First make sure its the right weight oil. Then you might want to check the oil sending unit, after that it gets pricey.
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Friday, December 17th, 2010 AT 1:29 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
No all oil presssure in these motors drop after the oil heats up no matter if it's synthetic or mineral oil. If you runabout 40-50 psi at about 2000 that's ok, if it drops to 20psi or around there that's about normal. Anytime you suspect an oil pressure problem always use a mechanical gauge.
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Friday, December 17th, 2010 AT 1:56 AM
Tiny
DAVE'S BIG BACKYARD!
  • MECHANIC
  • 262 POSTS
Yes oil doe's bake thin in all engines. That is as long as the pressure dont get to low, yes a gauge is best. Auto parts stores have the specks&or a book on the engine.
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Friday, December 17th, 2010 AT 2:22 AM

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