Synthetic Oil - 2005 Tahoe - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**Ironhorse** · 12-22-2019, 06:07 PM

Guys I am in totally new territory here for this old school shade tree mech. Just recently purchased a new to us 2005 Tahoe Z71 with the 5.3 V8. Think that classifies it as an LS1 but not sure?

Have always ran Quaker State 10W30 in vehicles changing with a WIX filter every 3000 miles. When in doubt on a used vehicle still always used the QS with no problems. When we bought the '05 all we were told is it was "full synthetic Dexos 1 oil" which I have found out is for gas engines, the Dexos 2 being for diesel. Pretty much the end of my knowledge there. No old oil change stickers found anywhere on the Tahoe so.......? Owner's manual says use 5W30 so am thinking just a QS 5W30 and a WiX filter since do not know the original brand used. Am I good here or ......?

12-22-2019, 06:07 PM	#1
Ironhorse Senior Member Join Date: Jul 2001 Location: Wellington, Ks Posts: 10,127	Synthetic Oil - 2005 Tahoe Guys I am in totally new territory here for this old school shade tree mech. Just recently purchased a new to us 2005 Tahoe Z71 with the 5.3 V8. Think that classifies it as an LS1 but not sure? Have always ran Quaker State 10W30 in vehicles changing with a WIX filter every 3000 miles. When in doubt on a used vehicle still always used the QS with no problems. When we bought the '05 all we were told is it was "full synthetic Dexos 1 oil" which I have found out is for gas engines, the Dexos 2 being for diesel. Pretty much the end of my knowledge there. No old oil change stickers found anywhere on the Tahoe so.......? Owner's manual says use 5W30 so am thinking just a QS 5W30 and a WiX filter since do not know the original brand used. Am I good here or ......? __________________ 1971 Chevy 1/2T 4x4 LWB 350 V-8 Was sm465-now 350TH/np205 Tilt, Tach, Towhooks Original Truck AM/FM Wellington, Ks



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