Should I use 5W30 on an 87 Pontiac Grand Prix Brougham V6 engine?
Car has just over 120,000 miles on it. I was thinking of synthetic high mileage oil. Is it a waste of money with no real difference?
I switched to 10w30 full synthetic on every car I've owned since as far back as I first read a report about it. It (I swear) has lasted longer between oil changes still looking like new. Lot of guys I asked said why go to 5 as it's only 5 until the engine warms up a tad.( viscosity increases with engine temp)
I would go for it, the high mileage has some additives in it to help the seals so they don't harden quite as fast and it tends to last longer between changes.
Agree. Go to synthetic and then double your oil change intervals. Changing the filter once between oil changes might be a good idea, but changing the oil sooner is just wasting money.
Looking for a Used Grand Prix in your area?
CarGurus has 2,825 nationwide Grand Prix listings starting at $1,595.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts