Syn Wgt for Street / Circuit

[almost_heaven]

Searched and did not find a good answer to this question. Wondering what you all recommend I use for a street car that will see some circuit track use in Virginia, with summer ambient temps near 100, winter near 30 degF? Car is 4.6L, 3v, 2007 Mustang GT, with CAI and 93 oct tune, about 300 rwhp, 28K miles.

OEM calls for 5w20. Have read that is for CAFE and 5w30 syn is better for reliabilty in winter, maybe 10w40 in summer. Am concerned with reliabilty, both from wear during start/warmup, and running at the track in the heat all day. I plan to start getting UOA after next OC.

 

[Pablo]

0W-20 or 5W-20

 

[Johnny]

Originally Posted By: almost_heaven
Searched and did not find a good answer to this question. Wondering what you all recommend I use for a street car that will see some circuit track use in Virginia, with summer ambient temps near 100, winter near 30 degF? Car is 4.6L, 3v, 2007 Mustang GT, with CAI and 93 oct tune, about 300 rwhp, 28K miles.

OEM calls for 5w20. Have read that is for CAFE and 5w30 syn is better for reliabilty in winter, maybe 10w40 in summer. Am concerned with reliabilty, both from wear during start/warmup, and running at the track in the heat all day. I plan to start getting UOA after next OC.



Originally Posted By: Pablo
0W-20 or 5W-20


SYNTHETIC

 

[Pablo]

Indeed. Synthetic.

Naturally I was thinking of Amsoil RD 20 and Amsoil ASM 0W-20

But Redline and M1 (as well as others) make some good 20's. Point being, don't switch to 10W-40. Whomever, told the OP that was bone headed. MAYBE go to a 0W/5W-30.

 

[hate2work]

Given those fairly high summertime ambient temps, I would use 0W-20 in the winter and 5W-30 in the summer. Amsoil ASM and ASL, full synthetic.