2005 - 2014 MustangsDiscussions on the latest S197 model Mustangs from Ford.
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i have been running royal purple in my whipple 07 mustang gt. this year i went to advance auto parts cause they have a special on royal purple 5 qts. and filter for $46. i bought the 5 + 1 but when i was checking out i noticed 2 out of the 6 were different labels but all were 5w-20. i ask the guy that works at advance and he said it's the exactly same oil just different label. well i went home and changed the oil and then started to read the labels more carefully. 4 bottles were the API service SN and 2 were API service SL with SYNERLEC. will this make any difference in protection? i do race at the track about 2X a month.
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07 GT, Whipple H.O., 3.375 pulley, kooks LT w/3" off road h pipe, '08 bullit axlebacks, frpp 3.73, shaftmasters 4" aluminum driveshaft, hurst billet, UMI Performance LCA & UCA, nitto 555 on foose nitrous v chrome wheels, cdc classic chin spoiler, side window louvers, 11.963et @119.52mph
The guy at Advance Auto doesn't know his a** from a hole in the ground. SN is the latest API grade. When your 2007 was new, the latest grade was SM. SL is an older API grade. I don't know for sure whether it makes any difference or not in your vehicle.
2007 Mustang GT Coupe Premium
High Performance White/Dark Charcoal Leather
Rear Spoiler Delete
Interior Sport Appearance Package
MGW EJECT Power Point Plug
"You can't rely on what's written on a piece of paper."--Ford Motor Company regional customer service representative regarding my car's production date as it appears on the Ford dealer's service invoices.
It won't make much of a difference and you will probably not notice anything different from the different oils. Like said before, SM was the 'series' (if you will) of the oil when your car was new. Using a 'series' newer will not hurt anything. You can go higher in series SN, SO, but it is suggested to not go lower. Really though, you are using a true synthetic oil so it is better than using some BS oil that is an SL series.
I wouldn't worry about it too much. Especially since only two quarts are going to be the older series of oil. They probably had some old oil that never sold and they are using the sale to off-load it. Take advantage and go get some more while they have it. Just try to get all of the SN series if you can.
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