Thread: Synthetic

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I run synthetic oil in almost all my engines, but I do the break in time on new engines with dinosaur oil. On street engines, I usually run about 2500 miles on the engine before I make the switch to synthetic..

Originally Posted by Dave Severson

I run synthetic oil in almost all my engines, but I do the break in time on new engines with dinosaur oil. On street engines, I usually run about 2500 miles on the engine before I make the switch to synthetic..

Wait wait.. My friend (he gets a really big head about shit and if you contradict him he basically gives you the bird). Anyways he kept telling me not to use synthetic in my new engine... I used Regular straight oil for 1500miles for the break in and went to synthetic blend. He still to this day tells me that that engine spun a rod because of the type of oil I used.
Was I alright using synthetic? or was I wrong...?

Originally Posted by weylinthedirty

Wait wait.. My friend (he gets a really big head about shit and if you contradict him he basically gives you the bird). Anyways he kept telling me not to use synthetic in my new engine... I used Regular straight oil for 1500miles for the break in and went to synthetic blend. He still to this day tells me that that engine spun a rod because of the type of oil I used.
Was I alright using synthetic? or was I wrong...?

One of the biggest reasons people spin rod bearings is in correct rod prep,not enough bearing clearance.
The rod under high load conditions becomes egg shaped or elongated what this means is it pinches in the middle which will cause oil starvation.