Been driving for over 35 years and have never used one. I've also never kept a car much past 100K miles and never had an oil related problem. But hey, you'll get others who swear by their use. For $50, if it gives you peace of mind, go for it.
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"America.... still builds rockets!"
Vette: 355 cid, 400 rwhp
'13 CTS-V Coupe: 6.2L LSA, 556HP
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