08-28-2014, 03:44 PM
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#1 (permalink)
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A True Z Fanatic
Join Date: Mar 2011
Location: Austin, TX
Age: 45
Posts: 36,450
Drives: 11 Z34, 98 E36 M3
Rep Power: 2684442
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Quote:
Originally Posted by edk370
Quick ? there oil experts.
If the car's manual says to use 0-20 oil, but I used 5-20 oil instead (unintentionally), is it bad for the car? The car is essentially new with less than 8000 miles.
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Having run into this exact same issue with my wife's Acura, I'll bite 
The issue is 0W-20 oil is fully synthetic, while the 5W-20 oil is semi-synthetic. And where it came up was when I tried to get the oil changed at a neighborhood shop and found out the cost difference is $70 vs $40. The owner's manual states that 5W-20 can be used, but you should immediately switch back to the 0W-20 on your next oil change. I confirmed with the dealer unequivocally that their oil change (as advertised with the sale of the vehicle) uses 5W-20 for the ILX model. The guy started backpedaling at record speed when I asked why they don't use 0W-20 per the manual.
Did you buy or lease? If lease, just have them always put the cheap 5W-20. If you own, buy 5 quarts of Mobil 1 0W-20 at Walmart for $25 and DIY or take the oil to your favorite shop. We lease, but I use the fully synthetic because it's cheaper for me to DIY. The two oils cost the same at Walmart, so my oil change winds up being cheaper than a semi-synthetic change at a shop.
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