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#1
10-14-2006, 10:36 AM
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5W-40 syntetich Engine oil 89 Sub 5,7 TBI
Hello, I'm a happy owner of a 89 Suburban K2500 with 5,7 TBI.
I've had some chevrolets over the past years, and have a question for you. What kind of engine oil are you using? I have used syntetich 5w-40 on my 350's, but the user manual says that f.eksampel 10w-40 should not be used. Anyone who do have a good answer for this? i might bellive its becaus its 10w-30/5w-30 gm has approoved their emmision with??? I dont see at there sould bee any problems using this 10w/40 oil either. (sorry for bad grammar  )Best regaard Eyvind from Norway 
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#2
10-15-2006, 09:37 AM
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Re: 5W-40 syntetich Engine oil 89 Sub 5,7 TBI
A good rule of thumb is to use what the manufacturer recomends but I think you will have no problems running 5w-40. I use 5W-30 Mobil 1 in both my vehicles. Stick with synthetic though, it is better.
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2009 Silverado 1500 2002 Camaro Z28(rebuilder) 2005 Yamaha GP1300R
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