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I run Penske Coolant in all my cars. 50/50 Already mixed. Dont think its safe to drink but safer than 100 percent antifreeze. As far as synthetic goes, you honestly do not need it. I would just run a name brand regular oil. No need to waste money. Maybe even a high mileage even if you dont have high mileage. I started running full synthetic when I boosted my car. PLUS in some cases if you have always run reg oil then switched, you may get a small leak here or there, happened to my friend when he switched in his 300ZX. Just something to think about.
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