4.3 s-10

[footballmoose]

I guess 91 was A VERY GOOD year ,my s-10(Durango) has 205,950 miles no knocks
no major work on eng or trans. The 4.3 tbi still outruns 98% of speed deamonds on the morning commute.

[Pismo74]

glad too hear it got a 91 4.3 as well great ride....s-10 blazer lotsof fun good freeway miles run a higher octane for a noticable differance.

[BlazerLT]

Higher octane in a 4.3L is a waste of good money.

Our engines are tuned for 87 octane.

[xtant]

I love how they run forever and no problems. My only problem was alternator until I rebuilt it to 140 amp.

[s10blazerman4x4]

you can put that lucas gas treatment in i get 18mpg for bout a month in my 4.3 91

[BlazerLT]

Lucas oil treatment does not increase fuel economy.

What it might do is raise compression slightly seeing it thickens the oil and might seal the pistons rings a little better.

[Mikado14]

He said gas treatment.

[BlazerLT]

Woops.....my bad.