I was searching around and haven't seen any follow up on fuel additives in about a year.
Are lots of members here running 200:1 two-stroke oil PLUS an additive such as Howes/Petrolabs?
I've been happy with two-stroke and want to treat my seals nicely. I recently bought a bottle of petrolabs and have been running petrolabs + two stroke and don't notice any difference from two-stroke.
I've had my L300 for about a year (second cdn owner) and ran 200:1 (300ml:60L) two stroke oil for most of the time to add lubrication as it looks like I had the classic diesel seep from the main IP seal, as well as a small leak from the turbo. Try to keep from overhauling these as long as possible.
My reason for running it is to add lubricity and to keep my 22 year old seals swelled nicely - especially those around my IP and Turbo. My engine runs nice and I get stock fuel economy from 10-12L/100km depending on hwy/city and generally cruise highway at 110km and no faster.
I'll also add that I've done two seafoam clenses 6 months apart (first one in fuel filter, second one via IP inlet/outlet lines and did seafoam in my crankcase once then dropped oil) and didn't notice a huge difference pre-and-post or any adverse effects from any of this so my engine is quite clean.
I've been experimenting with two stroke oil/Howe's Diesel Treat. I've been dropping in roughly 100ml of each. Motor runs smoothly but I'm not sure if it's because of the combo or if it's psychosomatic. All the same performance is good. Before I was only adding Howe's, the last few times I thought I'd try something slightly different.
Falco.
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Seek Beauty... Good Ship Miss Lil' Bitchi
...... Vision without action is a daydream. Action without vision is a nightmare. ~ Japanese Proverb
I get my best fuel economy with 300ml of 2-stroke and a full cap of Petrolabs. I will usually put in half a cap of Petrolabs and don't really notice much difference though, so it's probably negligible.
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Had: 1991 Mitsubishi Delica L300 SuperExceed, heavily modified (totalled by a drunk driver)
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Thanks. I will continue to run 200:1 two stroke, plus a 1/2 oz of petrolabs and see how I like results. If I ever drive a flat highway like #1 or the I-5 I'll see what it does for my fuel economy but since I'm usually on the Sea-to-Sky or city it is pretty tough to gauge fuel economy as it really depends on how aggressive I want to drive.
Dr Airtime, what kind of vehicle do you drive? In my Starwagon I typically get 8-8.5 litres/100 kilometres on the Number One out to Hope, where on the 99 it's more like 9.5 litres/100 kilometres.
Falco.
Sent from my smart pad, using a pen.
Seek Beauty... Good Ship Miss Lil' Bitchi
...... Vision without action is a daydream. Action without vision is a nightmare. ~ Japanese Proverb
Falco - I own a 91 Chamonix. 11L/100km is my best and that is probably going 105-110km/h on the flat nice-concrete I-5. Very fully loaded for multi-person mountain biking trip though. I run a thule box on top but don't think that is an issue with our flat vans.
There has never been an IP overhaul or turbo overhaul so I am guessing that is why I am not closer to your 8.5-9.5L/100km range. Injectors could be another, probably still original. Cost-benefit is not there on overhauls so I will prolong as long as possible.
We met at my CVI purchase inspection in May 2012 when you were there. Former CVI customer's Chamonix.
I generally do not use an additive. In most cases additives are subtractions from your pocketbook.
Having said that, I occasionally use pure Canola, and just today with 1/4 tank remaining I added a quart of Lucas Oil 10278 Engine Oil Stop Leak. I did so after noticing on the Oz forum that stop leaks (and a few posts here) tend to help to maintain the seals on the Bosch pump. In the US, diesel may have ethanol added, and that damages seals over time. Low sulphur diesel also does the same. Thus, it seems prudent to occasionally add something that maintains the seals.
Based on the anecdotal evidence from the Oz forum, a yearly dose of stop leak seems to help maintain the fuel pump seals.
It took me ages to pour it in the tank. Has the flow properties of molasses.