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Grade of oil for my 993

My owners manual says either 15W 30 or 15W 40. My mechanic says it calls for 5W 30 synthetic according to the specs heís read. And says 15 W 40 may be too thick for the upcoming Kansas winter. I donít want synthetic as I have a small leak and synthetic oil will find that leak. Should I go with 15 w 30? I usually donít drive when the temp is below freezing, but I do drive in any temp above 32F. Please help me
Old 10-07-2019, 05:04 PM
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any suggestions? I think I'm tending to 15W 40 if I don't hear from anyone. Need to get it to my mechanic by tomorrow.
Old 10-08-2019, 06:45 AM
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Ultimate Motor Oil Thread or Why we hate CJ4/SM oils
Old 10-08-2019, 07:30 AM
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I believe the factory calls for 10w 40 because you car has hydraulic lifters, any thicker, especially in the winter, can cause your lifters to stick and you'll hear them ticking. I believe this why Porsche use a thinner oil in the 993's
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Old 10-08-2019, 03:55 PM
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Quote:
Originally Posted by heliolps2 View Post
I believe the factory calls for 10w 40 because you car has hydraulic lifters, any thicker, especially in the winter, can cause your lifters to stick and you'll hear them ticking. I believe this why Porsche use a thinner oil in the 993's
Ok, so 15W 40 is too thick? Thatís what the owners manual calls for in temps below 50*F I live in Kansas, not Minnesota.
Old 10-08-2019, 06:26 PM
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I use Mobil 1 15w50 year round and top it off with 20w50 in the summer months. I donít drive it when temperatures in the low 30ís. Oklahoma is not as cold as Kansas. If I did Iíd probably throw in a quart or two of 10w40 and warm it up longer
Old 10-08-2019, 08:34 PM
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Originally Posted by wesleyc View Post
I use Mobil 1 15w50 year round and top it off with 20w50 in the summer months. I donít drive it when temperatures in the low 30ís. Oklahoma is not as cold as Kansas. If I did Iíd probably throw in a quart or two of 10w40 and warm it up longer
Am I ok w the 15w40? That is what the 993 owners manual recommends in temps below and above 50?
Old 10-09-2019, 11:28 AM
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Originally Posted by Kansas View Post
Am I ok w the 15w40? That is what the 993 owners manual recommends in temps below and above 50?
a good 15W-40 synthetic would cover you for most conditions, but 215w 50 for more hot and 10w-40 for more cold

remember that is for synthetic not mineral

what makes it a good synthetic is the ZDDP content, look for at least 1200 ppm Z & 1300 ppm P To get that many of us use M1 15W-50

I've recently some decent 15w-40 w/ that spec, Penn grad 1 being 1 of them
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Old 10-09-2019, 01:58 PM
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