Petro-Canada uses Tactrol as it's additive but I don't think they sell it separately.

I found a place in Toronto where they sell BG44K instead:

Golden Age Mobile Service
7605 Woodbine Ave., Unit 10
Markham

Tel: 905-415-3619

The distributor for BG44K in Canada is:

Wagonmaster
92 Worthington Ave.
Richmond Hill
Tel: 905-669-7949

Will try BG44K instead of Techron!

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190E 2.3, 1988