HenryPcar

Doing a coolant flush on my 997 this weekend. Someone recommended me Zerex G40 instead of the Porsche coolant and told me it is 100% compatible. Anyone used it on the 997 and vouch for the Zerex G40 ? They are a lot cheaper than Porsche branded coolant.

linderpat

been using it for years on my all aluminum block 928, and plan to use it on my new to me 997.1.

ogun228

Don't, it's not worth the risk just to save a few dollars. Proprietary coolant has specific lubricants
for your car.
Porsche coolant can be bought at a discount at Pelican Parts.

Lvt19672

Porsche doesn't make coolant, the coolant in the Porsche bottle is made by a company that makes coolant. You'll be fine.

linderpat

Zerex G40 isn't exactly a discount coolant. In fact, it is a premium level coolant, and designed specifically for aluminum blocks. It is an excellent coolant and well suited to our Porsches. I do not use it because of cost (high or low), I use it because of its quality. I would not use any other commercial big box store brand, and I see no need to fuss with "Porsche" branded coolant. All coolant should be changed every 2 or 3 years, regardless of mileage in between.

dgjks6

I use prestige universal on all my cars. To top off anyway, and some flushes or partial refills. Never had a problem. I have a BMW with 190,000 miles, audi with 185,000 miles, had a Grand Prix with 175,000 miles (daughter hit a tree with it), and an excursion with 235,000 miles. No coolant problems. Would not hesitate to use in my 911.