For many years i have put 5-30 oil in my fiat ducato motorhome , this year i was advised to put in 5-40 as it goes abroad, while checking the spec of the offered oil i noticed it was also ll04 so made a mental note of this and did the oil change.
Imagine my shock to find that my mpg dropped immediately by 5 mpg from a healthy 33 mpg to a maximum of 28 now.
the motorhome is taxed to 3850 kg so no lightweight like a zed, but it must affect it. Before you ask nothing has been changed in any way it also made no discernible difference whether the ac was on or off.
I cannot imagine that this oil was in any way different to another 5-40 to affect such a huge swing. This of course is immensely annoying to me and my wallet as in a couple of weeks it will be doing couple of thousand miles. I considered doing another oil change back to 5-30 but this would cost roughly the same as doing nothing and taking the fuel hit, and besides I'm curious to see if anything changes on the continent in warmer weather.
Imagine my shock to find that my mpg dropped immediately by 5 mpg from a healthy 33 mpg to a maximum of 28 now.
the motorhome is taxed to 3850 kg so no lightweight like a zed, but it must affect it. Before you ask nothing has been changed in any way it also made no discernible difference whether the ac was on or off.
I cannot imagine that this oil was in any way different to another 5-40 to affect such a huge swing. This of course is immensely annoying to me and my wallet as in a couple of weeks it will be doing couple of thousand miles. I considered doing another oil change back to 5-30 but this would cost roughly the same as doing nothing and taking the fuel hit, and besides I'm curious to see if anything changes on the continent in warmer weather.