For about 5 years I ran my 1.9 with a different ratio, 1/4 sometimes 1/3 of a quart of Lucas to each oil change.
Had good compression on that engine, which had never been cracked open, all the way to about 250,000 miles when I switched it out for a suby 2.2 

----- Original Message -----
From: Richard Duvernay <richard.duvernay@SBCGLOBAL.NET>
To: vanagon@GERRY.VANAGON.COM
Cc: 
Sent: Saturday, March 24, 2012 5:15 PM
Subject: Lucas Heavy Duty Stablizer

Hello Volks-

For the last year I have been running my stock 2.1,� which has over 200,000
miles on it,� with four quarts of Castrol 20w-50 and 3/4 of a quart of Lucas
Heavy Duty Oil Stabilizer.� Where I live it never gets below 30 degrees.� I have
noticed better oil pressure on my gauge-� 60 to 40 range, instead of 40 to 20
range and no lifter noises.� Anyone else have experience using this mix or an
opinion that this is not a good thing to do.

Rick
90 Westy