When I had the FIAT 128 Wagon, I'd drive 60 miles a day, highway. After a fresh LOF (with Castol GTX 10W40 during the warm month(s), 10W30 during the winter), I'd get 33 MPG.

Around 2.5K-3.0K, my mileage would start to drop off...by the time 3K was clocked on odo, I was down to 24-25 MPG...

I'd head off and do a LOF...the MsPG would jump right back up to 33 MPG.

Coincidence? I don't think so.

You could stick your index finger and thumb in the old stuff...you could "feel" the "sticktion" between the digits...still somewhat slippery, but not like out of the can. Stayed with that routine ever since 'til...

'Til the MOBIL 1 phase, I changed the oil and filter at 3K tops...and I felt like a criminal going anywhere over that...now, anything MOBIL 1 gets changed at 6K and I'm still running, trouble-free, on the same engine...that S-10 has 317K on the odo and I made the switch back about mid-150K.

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M. G. Burg
'10 - Dakota SXT - Daily Ride / ≈ 172.5K
.'76 - 450SLC - 107.024.12 / < .89.20 K
..'77 - 280E - 123.033.12 / > 128.20 K
...'67 - El Camino - 283ci / > 207.00 K
....'75 - Yamaha - 650XS / < 21.00 K
.....'87 - G20 Sportvan / > 206.00 K
......'85 - 4WINNS 160 I.O. / 140hp
.......'74 - Honda CT70 / Real 125
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“I didn’t really say everything I said.”
. . . . . . . . . . . . . . . . . . ~ Yogi Berra ~