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Discussion Starter · #1 ·
Hi folks
Anyone recommend this oil for breaking in a 350 (383) Chevy small block?
Millers Oils Classic Running In Oil 30
Ive read a few threads that saying that 20/50 is too thick for a flat tappet cam break in and that 30w would be better?
I do have 5ltr of the Halfords 20/50 classic oil on the shelf and some ZDDP additive.
Any thoughts on the safest option please?
Cheers
Al
 

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Discussion Starter · #9 ·
This old thread cast the doubts yesterday:

Here's couple tips for FLATTAPPET cam break in..
1- Use a light weight oil 10W30 is good...do not use heavy weight oils 10W40 or 20W50..... oil must be thinner for best oil splash & parts saturation during 30 min cam & lifter break in period
2- Add bottle of Comp Cams # 159 to oil.... and use BRAD PENN oil or ROYAL PURPLE break in oil.
3- Before breakin run we like to place small space heater under pan and warm oil to prox 130 F this is most important in winter time engine brake in times when engine is stored overnight outside or in non heated warehouses ect.
4- On camshaft lobes & lifter noses ( NONE ON SIDE OF LIFTER BODIES) use MOLY BASED paste such as ISKY moly paste or ARP assembly lube DONOT USE ENGINE ASSEMBLY GELL the red stuff it is useless and falls off cam & lifters almost instantly.
5- When you are having block machined insure that your machinest adds an oil groove to lifter bores in block ( use Comp Cams lifter goove tool) this vertical groove greatly increases oil feed to cam lobes and lifter noses for entire life of cam... also remember to hone lifter bores after groove tool.
6- Run engine @ 2500 + RPM for approx 30 min vary RPM during break in 2500 to prox 3500 RPM every 5 or so mins tickle the throttle.
7-After breakin period change oil & filter & add Comp Cams # 159 to oil.

Regards Daryl / Fastco Auto USA

Then started looking further... you know how it is.
I've always used 20/50 in the past and have the ZPPD so just a reassurance check before I chuck it in.
Thanks
Al
 
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