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Oil

780 views 4 replies 4 participants last post by  Maxwelhse 
#1 ·
So I work at advance auto and we have a crazy sale of castrol gtx part synthetic oil 10-40 for 35 cents a quart

I have a 4l and I know it takes 10-30 but Would it be ok to use that oil for just this one change?
 
#5 ·
The only caveat I would offer is that if you're currently using conventional, I wouldn't switch to synthetic, not even for a since change. I've seen to many motors get the "junk" cleaned out of the inside after switching that starting leaking oil afterward. The synthetic oil isn't the problem, its the cleaning of the garbage away from the oil seals that the conventional oil left behind (the junk was sealing the oil in, not the seals).
 
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