Re: Synthetic oils
IMHO, semi synthetic oil is good but fully synthetic oil is best. Cost is more but doi remember the interval between oil change is longer.
I was using mineral oil but changed to semi synthetic oil and found that the engine runs quiter and much smoother despite having same viscosity index. It is what you pay. pay more, get better oil.
It actually works out to be almost the same when it comes to cost. In 5,000 KM you change the mineral oil but you only change the semi or fully synthetic oil every 10,000 KM. Just remember to change the oil filter every 5,000KM even if you're using synthetic oil.
Since your engine is comsuming oil, why not put in a thicker oil like 20W50 rather than using the 5W30?
Suzuki Samurai (SJ413 Jimny in Asia)
K&N Air Filter, Shackle Lift, Larger Than Stock Tires,Wheel Spacers, Driving & Spot Lamps, Gabriel Gas Ryder Shocks
Kuala Lumpur, Malaysia