Should I use 5W30 on an 87 Pontiac Grand Prix Brougham V6 engine?

Asked by Jun 05, 2014 at 03:27 PM about the 1987 Pontiac Grand Prix Brougham

Question type: General

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?

3 Answers


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)

1 out of 1 people think this is helpful.

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.

2 out of 2 people think this is helpful.

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.

1 out of 1 people think this is helpful.

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