You don't NEED it but it will help as long as your engine is still in good condition. I never used it as I had street parking only, always started up even on the coldest days.

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth