The funds in our "Magnificent Retirement Mutual Funds" list are among the best managed and best performing mutual funds available. If you are just finding out about our Top-Ranked Funds list, we welcome you!

How can you tell a good mutual fund from a bad one? It's pretty basic: if the fund is diversified, has low fees, and shows strong performance, it's a keeper. Of course, there's a wide range, but using our Zacks Rank, we've found three mutual funds that would be great additions to any long-term retirement investors' portfolios.

Let's learn about some of Zacks' highest ranked mutual funds with low fees you may want to consider.

Direxion Monthly S&P 500 Bull 2X Investor (DXSLX): 1.35% expense ratio and 0.75% management fee. DXSLX is classified as an Allocation Balanced fund, which seeks to invest in a balance of asset types, like stocks, bonds, and cash, and including precious metals or commodities is not unusual. DXSLX has achieved five-year annual returns of an astounding 18.49%.

Oppenheimer Gold & Special Mineral I (OGMIX). Expense ratio: 0.75%. Management fee: 0.68%. OGMIX is classified as a Sector - Precious Metal fund, and these mutual funds invest in stocks with a focus on the mining and production of precious metals like gold, silver, platinum, and palladium. This fund has managed to produce a robust 11.71% over the last five years.

JPMorgan Large Cap Growth R2 (JLGZX) is an attractive large-cap allocation. JLGZX is a part of the Large Cap Growth mutual fund category, which invest in many large U.S. companies that are expected to grow much faster compared to other large-cap stocks. JLGZX has an expense ratio of 1.18%, management fee of 0.45%, and annual returns of 14.68% over the past five years.

We hope that your investment advisor (if you use one) has you invested in one or all of the top-ranked mutual funds we've reviewed. But if that isn't the case, it might be time to have a conversation or reconsider this vitally important relationship.

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