I'll check out the Hengst next time. Thanks for the info Larry. That analysis makes sense. I'm sure Rotella and Delvac will work their formulas to try to exceed Delo. Competition and the free market are a great thing.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory