Miata Mailing List: September 1993, Message #8
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   From: BUCKINGHAM@LANDO.HNS.COM
Subject: synth oil
   Date: Wed, 1 Sep 1993 11:59:13 -0400



	Thanks to all the people who responded to my request for 
info on using synthetic oil in the Miata. The concensus seems to be 
Mobil 1 changed every 3000 miles. Which brings up a coupla questions:

- I always thought 3000 miles was the recommended interval between 
  engine oil changes for regular (non-synthetic) oil, and that one of
  the advantages of synthetic oil was that you could change it (but 
  not the filter) less frequently for the same effect thus offsetting 
  the cost difference. For those who are changing Mobil 1 every 3000..
  ... why? Would you change regular oil every 1000 - 1500 miles if 
  synthetic wasn't around? Or is it that synthetic oil doesn't last 
  longer than regular oil?


- the ad that prompted me to consider synthetic oil was for something 
called " Blueprinted Synthoil 100". The ad was in a 1992 issue of 
European Car and quoted many extracts from auto magazines (VW & 
Porsche etc.) upholding the claims of the manufacturer which were:

(at 55mph)

11% better fuel economy
9% more BHP
50,000 miles between changes (equiv to 5000 miles for regular oil)
Better corrosion resistive properties than other synth oils

I should point out that this stuff was selling for $8-10 a quart
depending on quantity. Has anyone heard anything about this product?