Can I use Rotella 15w40 in my Harley?

Rotella 15w40 is a great oil, IMO, and I use it in my Sportster. However, I can assure you that the HT/HS vis of virtually any 20w50 oil, be it conventional or synthetic, will be higher than that of the Rotella 15w40.

Can I use conventional oil in my Harley?

Despite its age, your engine is not “adapted” to only conventional oil. It does not matter if the engine was broken-in using mineral oil. Once converted to synthetic oil, the motorcycle will now have improved performance on a number of fronts. AMSOIL V-Twin 20W-50 lowers friction and withstands extreme heat.

Can you mix synthetic oil with regular oil?

The short answer is… yes. If you don’t have a choice, adding synthetic oil to regular oil can help you out in a pinch. Since motor oils are generally made from the same ingredients (base oil and additives), they are typically compatible when mixed.

Can you switch back and forth between synthetic and regular oil?

You can switch back and forth at any time. In fact, synthetic blends are simply a mixture of synthetic and conventional oils. It is advisable that you use the same oil for top-ups if needed, thereby giving you the best protection from the oil that you have chosen.

Is it better to use thicker oil in older engines?

Newer vehicles can utilize thinner oils for faster lubrication of new engine parts. In contrast, older, high-mileage engines benefit from thicker oils to prevent friction and oil loss.

What is the best engine oil for high mileage?

Best Motor Oil For High Mileage Engines

Valvoline (VV150-6PK) MaxLife 10W-40 Higher Mileage Motor Oil.
Pennzoil High Mileage Vehicle Oil.
Mobil 1 45000 5W-30 High Mileage Motor Oil.
Castrol 06470 GTX 20W-50 High Mileage Motor Oil.

Is synthetic oil better for older engines?

Full synthetic oils are always a good choice for older vehicles that have been used a lot. They are perfect for lubricating motor parts as they do it much better than any other oil.

Is synthetic oil a waste of money?

Synthetic costs more, but has many advantages over conventional oil. The thing is, not every car needs it, so using it may be a waste of money. Compared to standard motor oil, synthetic oil takes longer to break down, can withstand higher temperatures and can flow easier in cold temperatures.

What is the best engine oil?

Mobil 1 Extended Performance Full Synthetic Motor Oil 5W-30, 5 Quart.
Amazon Basics High Mileage Motor Oil, Full Synthetic, SN Plus, dexos1-Gen2, 5W-30, 5 Quart.
Castrol 03095 GTX 20W-50 Conventional Motor Oil – 5 Quart.
Shell Rotella T6 Full Synthetic 5W-40 Diesel Engine Oil (1-Gallon, Single Pack, New Packaging)