Best Answer

It depends entirely on the condition of your engine. If the bearings are in good condition, use a lighter weight oil (lower numbers). If the bearings are getting a little worn, use a thicker weight oil (HIGHER numbers). Watch the oil pressure gauge. If, after the engine warms, the oil pressure starts to drop to near zero during idle, use a thicker oil. If the oil pressure stays up when the engine is warm and idling, you might be able to use a lighter grade oil. As related to the brand, use whatever has been running in the engine in the past, so long as it's a respected brand with the SAE certifications.

User Avatar

Wiki User

2006-03-25 06:58:09
This answer is:
User Avatar
Study guides

Where I can purchase purchase HID Fargo ID card in Dubai

See all cards
8 Reviews

Add your answer:

Earn +20 pts
Q: What type oil to use for 1999 suburban lt 1500?
Write your answer...
Still have questions?
magnify glass
People also asked