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oil in a rebuilt
just got the rebuilt motor back in thr 84. someone told me if i use anything lower than 10 40 wt oil, i should put an additive in cause the lower oils dont protect like 10 40. any thoughts? thanks
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What? That makes little sense.
Flat tappet cam or roller? If it's a flat tappet you need to run either Valvoline VR1, Joe Gibbs (or some other specifically made flat tappet oil) or you MUST run an additive. Off the shelf oil from an auto store will not cut it. |
run what the machine shop recommends. they set the bearing clearances. also what bill said.
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I've always used 10-30W with an additive. I perfer the GM new assembly lube. Initial run of the engine for 15-20 minutes varing the RPMs from 1,000 to 1,700 for a roller cam, 1,500 for flat tappet. After cool down, change oil/filter and refill same weight and another can of the breakin lube and change at 200-250 miles. Changing the oil after 15 minutes is key, the heavy assembly lubes, such as molycoat, can actually clog the filter over time so you want to drain that out.
GM PART # 88862586 |
Right now im running 10 - 40 with Redline Break in additive for the zinc and phosphorous. Flat Tappet cam
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royal purple breakin oil ftw
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i always use rotell T 15w40
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Rotella T does not have the right additive package for a flat tappet anymore. It used to.
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Edit: Looks like good stuff. What weight do you run? |
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Awesome, thanks! Im assuming with this it isnt necessary to run an additive as well?
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No additive from what I've heard:
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Sweet, i will definitely run the VR1 when i change the oil again. Thanks for the help
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No problemo. And remember, (if you are a 4-spd) synthetic in your Muncie can be a no-no as well.
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When I finish my 3.8, how should i break that in, it has roller cam in it, and a cat, so i can't run a zinc add. in it.
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The cool thing about rollers is you don't have to do any of the flat tappet BS like the half hour run-in or ZZDP in your oil. |
Everything will be brand spanking new.
Abbot cam -210/220 @ .050 -.320" lobe lift on the intake, .512 with a 1.6 rocker ratio -.320 lobe lift on the exhaust, .512 with a 1.6 rocker ratio -112 lobe separation |
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